add message on top main with info about branch/revision data

tools/jerry_gen_version_h.sh

@@ -0,0 +1,31 @@
+# Copyright 2014 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#!/bin/bash
+
+OUT_FILE=$1
+
+GIT_BRANCH=$(git symbolic-ref -q HEAD)
+GIT_HASH=$(git rev-parse HEAD)
+BUILD_DATE=$(date +'%d/%m/%Y')
+
+echo "#ifndef VERSION_H"                                           >  $OUT_FILE
+echo "#define VERSION_H"                                           >> $OUT_FILE
+echo ""                                                            >> $OUT_FILE
+echo "static const char *jerry_build_date = \"$BUILD_DATE\";"      >> $OUT_FILE
+echo "static const char *jerry_commit_hash = \"$GIT_HASH\";"       >> $OUT_FILE
+echo "static const char *jerry_branch_name = \"$GIT_BRANCH\";"     >> $OUT_FILE
+echo ""                                                            >> $OUT_FILE
+echo "#endif	/* VERSION_H */"                                   >> $OUT_FILE
+